DSTV billing for false phony services.

I have been trying to resolve billing issue with MultiChoice to no avail. I had premium package due to inconsistent poor billing I downgraded my package to a R129 package. Since inception I never paid R129 my bill for 1 TV and decoder now was in the R550 range. When I request breakdown of billing it would be less than R300 including additional stuff I did not know what they were. I decided to cut my service with them for the whole of December. Today I receive a bill for R554. My DSTV is off but they continuosly increase the bill. I contacted MultiChoice with no luck. Just to get understanding what I am billed for.